Traces of the old domain name after a rename
When you have renamed a domain there will be some registry keys left with the old domain name under HKLM\System\CCS\Services\NTDS\Parameters
Name: “Configuration NC”
Name: “Machine DN Name”
Value: CN=NTDS Settings,……,CN=Configuration,DC=oldname,DC=com
Name: “Src Srv objectGuid”
Those keys where created by LSASS.exe when the DC was created with DCPROMO. Rendom.exe will not modify them. They are not vital and are not in use. You can update those keys for consistency if you like.
Credit to Ned Pyle at AskDS for the information.